JPS63203426A - Four-wheel-drive vehicle with electric motor - Google Patents

Abstract

PURPOSE:To improve the extent of usability, by driving wheels by an electric motor at the time of detecting a hindrance peculiar to an urban area preventing air pollution and noise from occurring, and when an amount of residual battery capacity is little, driving these wheels by an engine. CONSTITUTION:Symmetrical front wheels 23R and 23L are driven by the engine 21 mounted in front of a vehicle 20 via a transmission. Likewise, symmetrical rear wheels 24R and 24L are driven by the battery mounted in the rear of the vehicle 20 via an electric motor 24. In this constitution aforesaid, each signal out of a fault detecting sensor 28 for noise and radio noise or the like and a battery residual capacity detecting sensor 29 is inputted each into a central processing unit 31 in an electronic control circuit 30. And a signal is outputted to a drive selector device 32 from this CPU 31, and either side of the engine 21 or the electric motor 25 is driven. With this constitution, the motor 25 is driven, preventing air pollution and noise from occurring, while a battery is charged with the engine 21 driven.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is characterized in that either the front wheels or the rear wheels are driven by an engine, and the other of the front wheels or the rear wheels is driven by an electric motor. The present invention relates to a four-wheel drive vehicle with an electric motor driven by Jla.

[Prior art]

Conventionally, regarding motorized four-wheel drive vehicles in which either the front wheels or the rear wheels are driven by an engine and the other of the front wheels or rear wheels is driven by an electric motor, for example,
This is proposed in Japanese Patent No. 5-138129. To explain this with reference to FIG. 4, the driving force of the engine 1 is transmitted to the Mitsushiran 3 via the clutch 2, and further transmitted to the left and right front wheels 5R15L via the differential gear 4. On the other hand, the driving force of the electric motors 8, 8 is transmitted to the left and right rear wheels 6R16L through one-way clutches 7.7, respectively, and the electric motor 8.8 is driven by a generator 9 connected to the engine. Driven. The controller IO includes an accelerator switch 11 and a load current detector 1.
2. When the accelerator pedal is depressed and the vehicle speed is below a set value, the electric motor 8.8 is controlled to drive the front and rear wheels using a signal from a vehicle speed switch or the like.

Furthermore, electric vehicles whose electric motors are driven by batteries are also known.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional four-wheel drive vehicle with an electric motor, when the accelerator pedal is depressed and the vehicle speed is below a set value, the electric motor 8.8 is activated to drive the front wheels. It is controlled to drive the rear wheels, and is always driven by an internal combustion engine, regardless of whether it is in the city or the suburbs.
Particularly in urban areas, exhaust gases pose problems of air pollution and noise generation.

Furthermore, electric vehicles whose electric motors are driven by batteries have problems in that they are inferior in power performance compared to engine-driven vehicles, and in addition, due to the capacity of the battery, the distance traveled per charge is inferior.

The present invention solves the above problem, and aims to prevent air pollution or noise generation by making it possible to switch between engine drive and electric motor drive, and also,
The purpose is to enable charging of the battery when the remaining capacity of the battery is low.

[Means for solving problems]

To this end, the electric motorized four-wheel drive vehicle of the present invention is an electric motorized four-wheel drive vehicle in which one of the front wheels or the rear wheels is driven by an engine, and the other of the front wheels or the rear wheels is driven by a battery-powered electric motor. a failure detection means for detecting a specific failure; a battery remaining amount detection means;
Judgment means that determines the presence or absence of a fault and the remaining battery power by comparing the signals of the fault detection means and the remaining battery power detection means with set values; In that case, electric Ja
The apparatus is characterized by comprising a drive switching means for switching to engine drive when the determining means determines that the remaining battery power is low or that there is no failure.

[Action and effect of the invention]

In the present invention, for example, as shown in FIG. 3, the noise level is read from the noise detection sensor 28 (steps
), then read the remaining battery power from the remaining battery detection sensor (■). Next, it is determined whether the remaining battery capacity is greater than the set value α (■), and if the remaining battery capacity is greater than the set value α, the process proceeds to step ■ to determine the noise level, and the remaining battery capacity is determined to be the set value α. If it is not larger than that, a signal is output to the drive switching means to switch to engine drive (■). In step ■, it is determined whether the noise level is greater than the set value β, and if it is not greater than the set value β, the process proceeds to step ■, where a signal is output to the drive switching means to switch to engine drive, and the If it is larger than the value β, a signal is output to the drive switching means to switch to electric motor drive (■).

Therefore, when a problem specific to urban areas is detected, engine drive is switched to electric motor drive, which prevents air pollution or noise generation.Also, when the battery level is low, the engine drive is prioritized. By switching to drive, the battery can be charged.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of a four-wheel drive vehicle with an electric motor according to the present invention, FIG. 2 is a block diagram showing an embodiment of a control system for a four-wheel drive vehicle with an electric motor according to the present invention, and FIG. The figure is a diagram for explaining the flow of processing in the electronic control circuit of Figure 2.In the figure, 20 is the vehicle, 21 is the engine, 22 is the transmission cylinder, 23R, 23L are the front wheels, 24R, 24L
25 is a rear wheel, 25 is an electric motor, 26 is a battery, 28 is a failure detection sensor, z9 is a battery remaining amount detection sensor, 30 is an electronic control circuit, 31 is a CPU, and 32 is a drive switching means.

In FIG. 1, an engine 21 is mounted on the front part of a vehicle 20, and the driving force of the engine 21 is transmitted to a transmission 2.
2 to the left and right front wheels 23R123L, and the left and right rear wheels 24R, 24 are each powered by an electric motor 25.
．． The driving force of 25 is transmitted to the vehicle 20.
Electric w125 with battery 26 mounted on the rear of
．． 25 is driven.

FIG. 2 shows one embodiment of the control system of the present invention, in which signals from a failure detection sensor 28 such as a noise detection sensor and a radio wave noise detection sensor and a battery remaining amount detection sensor 29 are input to a CPU 31 in an electronic control circuit 30. , a signal is output to the drive switching means 32 based on the judgment of the CPU 31, and a drive signal for either the engine 21 or the electric motor 25 is output.

Next, the flow of processing in the electronic control circuit 30 will be explained with reference to FIG. 3. After setting the initial value, the noise detection sensor 28
Load more noise levels (steps ■, ■), then
The remaining battery power is read from the detection sensor (■). Next, determine whether the remaining battery capacity is greater than the set value α (■), and if the remaining battery capacity is greater than the set value α, proceed to step ■ to determine the noise level;
If the remaining battery capacity is not greater than the set value α, a signal is output to the drive switching means to switch to engine drive (■). In step ■, it is determined whether the noise level is greater than the set value β. If the value is not larger than the set value β, the process proceeds to step 3, and a signal is output to the drive switching means to switch to engine drive, and if it is larger than the set value β, a signal is output to the drive switching means to switch to electric motor drive. Output a signal (■).

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made.

For example, in the embodiments described above, disturbances peculiar to urban areas are detected by the noise detection sensor, but disturbances peculiar to urban areas may be detected by detecting radio noise.

Further, in the embodiment described above, when a fault peculiar to urban areas is detected, the drive is switched to electric motor drive, but the ratio of electric motor output to engine output may be increased.

Further, in the above embodiment, the front wheels are driven by the engine and the rear wheels are driven by two electric motors, but the rear wheels may be driven by the engine and the front wheels by an electric motor. The front wheels or the rear wheels may be driven by two electric motors.

As explained above, according to the present invention, engine drive and electric motor drive are switched by determining obstacles specific to urban areas, so air pollution or noise generation can be prevented, and the remaining battery capacity can be reduced. If the amount is low, the battery can be charged by preferentially switching to engine drive.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a four-wheel drive vehicle with an electric motor according to the present invention, FIG. 2 is a block diagram showing an embodiment of a control system for a four-wheel drive vehicle with an electric motor according to the present invention, and FIG. This figure is a diagram for explaining the flow of processing in the electronic control circuit of FIG. 2, and FIG. 4 is a schematic configuration diagram showing a conventional electric motor-equipped four-wheel drive vehicle. 20... Vehicle, 21... Engine, 22... Transmission, 23R, 23L... Front wheel, 24R,
24L... Rear wheel, 25... Electric motor, 26... Battery, 28... Failure detection sensor, 29... Battery remaining amount detection sensor, 30... Electronic control circuit, 31.
... CPIJ, 32... Drive switching means. Applicant Aisin Warner Co., Ltd. (1 other person) Representative Patent Attorney Hiroki Shirai (2 others) Engine Figure 2 Figure 3

Claims (3)

[Claims] (1) In an electric four-wheel drive vehicle in which one of the front wheels or the rear wheels is driven by an engine and the other of the front wheels or the rear wheels is driven by a battery-powered electric motor, an obstacle detection means for detecting obstacles peculiar to urban areas; , a remaining battery amount detection means, a judgment means for determining the presence or absence of a fault and the remaining battery amount by comparing the signals of the fault detection means and the remaining battery amount detection means with a set value; drive switching means for switching to electric motor drive if the determination means determines that there is a problem due to a large amount of power remaining in the battery, and for switching to engine drive if the determination means determines that the remaining battery power is low or that there is no problem. 4 wheel drive vehicle with electric motor. (2) The motorized four-wheel drive vehicle according to claim 1, wherein the obstacle detection sensor detects noise. (3) The motorized four-wheel drive vehicle according to claim 1, wherein the failure detection sensor detects radio noise.